Answer:
Dismas and Gestas are the names sometimes mentioned as the two thieves crucified on crosses to the right and left of Jesus. In the New Testament accounts of the crucifixion, two men are mentioned, yet their names are never given. The names Dismas and Gestas do not come from the New Testament, but are taken from a pseudepigraphal book not included in the New Testament canon. As a result, whether Dismas and Gestas were the true names of the two men crucified at the time of Jesus is unknown.

The names Dismas and Gestas are first found in the apocryphal writing entitled “The Gospel of Nicodemus” that historians typically agree was written in the 4th century. Since this document was written over two centuries after the events and is found in a book containing other disputable information, few argue that much certainty can be attached the these two specific names.

Finally, it should be mentioned that Dismas (sometimes spelled Dysmas) was the name associated with the good thief who asked Jesus to remember him in paradise (Luke 23:43), while Gestas was the one who taunted Jesus along with the crowd. In the Roman Catholic tradition, Dismas was canonized as a saint whose feast is celebrated March 25.